I have heard that if you have passed both the 70-667 and 70-668 exams pertaining to SharePoint 2010, they will be equivalent to one of the SharePoint 2013 exams. Anyone know or have any information on which SharePoint 2013 exam these 2 tests will count towards?
Yes you are right, I read it on MSDN a while ago that you can upgrade your certifications to SharePoint 2013 by giving some extra exams instead of going through all of them, I will try to find a link for you now.
I just spoken to a Microsoft Adviser and they said,
If you have earned MCITP: SharePoint Administrator 2010 (667 and 668) then you only need to pass 3 exams to upgrade to MCSE SP 2013.
Those exams are 417, 331 and 332
There isn't any upgrade path for MCPD SP 2010 came out yet.
For more information check this link out.